Drop Python 3.9 support, add 3.14, fix filelock security vulnerability

- Drop Python 3.9 (EOL October 2025)
- Add Python 3.14 support (tested locally, all 438 tests pass)
- Update filelock to >=3.24.3 to fix security vulnerability
- Update CI test matrix to 3.10-3.14

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Bucknalla

.github/workflows/python-ci.yml

@@ -27,7 +27,7 @@ jobs:
       runs-on: ubuntu-24.04
       strategy:
         matrix:
-          python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
+          python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
 
       env:
         DD_API_KEY: ${{ secrets.DD_API_KEY }}

Pipfile

@@ -4,7 +4,7 @@ verify_ssl = true
 name = "pypi"
 
 [packages]
-filelock = ">=3.4.1"
+filelock = ">=3.24.3"
 
 [dev-packages]
 python-periphery = "==2.3.0"
@@ -19,6 +19,6 @@ pytest-cov = "*"
 build = "*"
 twine = "*"
 pre-commit = "*"
-exceptiongroup = "*"  # Python 3.9 & 3.10 compatibility with pytest
+exceptiongroup = "*"  # Python 3.10 compatibility with pytest
 doxypypy = "*"  # For generating API documentation
 requests = "*"